Angular position prediction for engine ignition control

Abstract

An engine ignition control system includes a device adapted to receive the ignition timing signal which is generated by the engine original ignition pulse generator. The device derives a pulse sequence synchronous with the rotation of the engine from the original ignition timing signal. The device then generates a precision ignition signal from the synchronous sequence pulse at the optimum ignition angle. The precision ignition signal is supplied back to the original ignition system of the engine for the generation of the ignition sparks. The synchronous pulse sequence represents the angular position of the rotation of the engine in higher accuracy then the original ignition timing signal. In preferred embodiments, the synchronous pulse sequence represents the angular position of the engine up to 1 degree making high accuracy ignition advance control for most old engines that can produce only the ignition timing signal from its original ignition pulse generator possible.

What is claimed is: 
     
       1. An engine ignition control system for internal combustion engines comprising an ignition control device arranged to receive an original ignition timing signal, an engine rotation angular position predictor in said ignition control device generates a pulse sequence synchronous with the rotation of the engine, said ignition control device further arranged to generate an ignition pulse for the generation of the sparks from said synchronous pulse sequence at an optimum ignition angle. 
     
     
       2. The engine ignition control system of claim 1 wherein said engine rotation angular position predictor derives said synchronous pulse sequence from said original ignition timing signal by a prediction algorithm, said to predict an instantaneous angular position of said engine. 
     
     
       3. The engine ignition control system of claim 2 wherein said original ignition timing signal and the synchronous pulse sequence generated in one cycle of said engine are in the ratio of R:S where R and S are different integers, S being the multiple of R. 
     
     
       4. The engine ignition control system of claim 3 wherein said optimum ignition angle is stored in memory device. 
     
     
       5. The engine ignition control system of claim 3 wherein said optimum ignition angle is determined by a computing device. 
     
     
       6. The engine ignition control system of claim 3 wherein said optimum ignition angle is provided by an external device through an external interface. 
     
     
       7. The engine ignition control system of claim 3 further comprising a function to set and validate a device identification code. 
     
     
       8. The engine ignition control system of claim 3 further comprising a function to set a maximum speed limit for the said engine.